Automatic invoice reduction and automatic acceptance set

What causes this issue?

You have entered tolerance limits for automatic invoice reduction and
automatic acceptance.

System Response

Which of these tolerance limits the system checks when there is a
positive Invoice Verification difference depends on the following
conditions.
Normally, if you make this setting, the system tries to reduce the
invoice automatically, The tolerance limits for automatic acceptance are
not then taken into account.
In the following cases, the system does not try to reduce the invoice.
Here it tries to accept the invoice.
A credit memo is involved. Automatic invoice reduction can only be used
for invoices.
A supplier error (manual invoice reduction) was already entered at item
level.
An invoice difference was manually accepted at invoice header level.
There is a negative tax difference for one tax code.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.